package org.eclipse.rally.plugin;

import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.rally.plugin.logger.PluginLogManager;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {
	
	private static final String LOG_PROPERTIES_FILE = "/logger.properties";
	private PluginLogManager logManager;

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.rally.plugin";

	// The shared instance
	private static Activator plugin;
	
	/**
	 * The constructor
	 */
	public Activator() {
		super();
		plugin = this;
	}
	
	public static PluginLogManager getLogManager() {
		return getDefault().logManager; 
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
		configure();
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		super.stop(context);
		if (this.logManager != null) {
			this.logManager.shutdown();
			this.logManager = null;
		}	
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

	/**
	 * Returns an image descriptor for the image file at the given
	 * plug-in relative path
	 *
	 * @param path the path
	 * @return the image descriptor
	 */
	public static ImageDescriptor getImageDescriptor(String path) {
		return imageDescriptorFromPlugin(PLUGIN_ID, path);
	}
	
	private void configure() {
	      
		  try {
		   	InputStream propertiesInputStream = this.getClass().getResourceAsStream(LOG_PROPERTIES_FILE);
		    if (propertiesInputStream != null) {
		    	Properties props = new Properties();
		    	props.load(propertiesInputStream);
				propertiesInputStream.close();
				this.logManager = new PluginLogManager(this, props);
		   	}	
		  } 
		  catch (Exception e) {
		  	String message = "Error while initializing log properties." + 
		  	                 e.getMessage();
			IStatus status = new Status(IStatus.ERROR,
					getDefault().getBundle().getSymbolicName(),
					IStatus.ERROR, message, e);
			getLog().log(status);
		  	throw new RuntimeException(
		  	     "Error while initializing log properties.",e);
		  }         
		}

	public void removeLogManager(PluginLogManager pluginLogManager) {
		// TODO Auto-generated method stub
		this.logManager = pluginLogManager;
	}

	public void addLogManager(PluginLogManager pluginLogManager) {
		// TODO Auto-generated method stub
		this.logManager = pluginLogManager;
	}
}
